Refactor unittests

tests/compiler/dart2js/mirrors_helper.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/**
- * This file is read by 'mirrors_test.dart'.
- */
-
-library mirrors_helper;
-
-typedef E Func<E,F extends Foo>(F f);
-
-main() {
-
-}
-
-/// Singleline doc comment.
-@Metadata(null)
-// Singleline comment 1.
-// Singleline comment 2.
-@Metadata(true)
-@Metadata(false)
-@Metadata(0)
-@Metadata(1.5)
-@Metadata("Foo")
-@Metadata(const ["Foo"])
-@Metadata(const {'foo':"Foo"})
-@metadata
-/** Multiline doc comment. */
-/* Multiline comment. */ class Foo {
-  m(@metadata a) {}
-}
-
-
-abstract class Bar<E> {
-
-}
-
-class Baz<E,F extends Foo> implements Bar<E> {
-  Baz();
-  const Baz.named();
-  factory Baz.factory() => new Baz<E,F>();
-
-  static method1(e) {}
-  void method2(E e, [F f = null]) {}
-  Baz<E,F> method3(E func1(F f), Func<E,F> func2) => null;
-
-  bool operator==(Object other) => false;
-  int operator-() => 0;
-  operator$foo() {}
-}
-
-class Boz extends Foo {
-  var field1;
-  int _field2;
-  final String field3 = "field3";
-
-  int get field2 => _field2;
-  void set field2(int value) {
-    _field2 = value;
-  }
-}
-
-class _PrivateClass {
-  var _privateField;
-  get _privateGetter => _privateField;
-  void set _privateSetter(value) => _privateField = value;
-  void _privateMethod() {}
-  _PrivateClass._privateConstructor();
-  factory _PrivateClass._privateFactoryConstructor() => null;
-}
-
-const metadata = const Metadata(null);
-
-class Metadata {
-  final data;
-  const Metadata(this.data);
-}